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What is OpenCV contrib?

What is OpenCV contrib?

OpenCV (open source computer vision) is a very powerful library for image processing and machine learning tasks which also supports Tensorflow, Torch/Pytorch and Caffe. Choose only the OpenCV contrib modules you want by selecting/deselecting them as appropriate when building in Cmake.

How do I download OpenCV contrib?

The steps to follow are:

  1. Install Visual Studio 2013.
  2. Install CMake.
  3. Download both opencv and opencv_contrib from github.
  4. Create a directory opencv-3.1.
  5. Unzip opencv-master.
  6. In the sources directory created in step 4, paste opencv and opencv_contrib directories.

What is current version of OpenCV?


Original author(s) Intel Corporation, Willow Garage, Itseez
Stable release 4.5.3 / 5 July 2021
Written in C/C++
Operating system Cross-platform

Why Some modules are contained in OpenCV contrib repository?

This repository is intended for the development of so-called “extra” modules, contributed functionality. New modules quite often do not have stable API, and they are not well-tested.

What is OpenCV used for?

OpenCV is the huge open-source library for the computer vision, machine learning, and image processing and now it plays a major role in real-time operation which is very important in today’s systems. By using it, one can process images and videos to identify objects, faces, or even handwriting of a human.

How long does it take to build OpenCV?

When I install opencv-python-headless in Google Colab, it takes 15 minutes to complete.

How do I know if Python OpenCV contrib is installed?

To see if you have installed it successfully, fire up your Python and issue the following command:

  1. import cv2 # import the opencv library.
  2. cv2. __version__ # this will print the version of your opencv3.

How long does it take to install OpenCV contrib Python?

The C++ installation is done with the help of custom setup exe files. Whereas Python installation is done with Anaconda. Installing OpenCV from source takes up a lot of time. Depending on your hardware, and the installation configuration, it can take anywhere from 5 minutes up to 2 hours.

How do I know if OpenCV is installed?

Check OpenCV Version

  1. import cv2.
  2. Use __version__ on cv2 to get its version. cv2.<< your code comes here >>

Is OpenCV and cv2 same?

Later, OpenCV came with both cv and cv2 . Now, there in the latest releases, there is only the cv2 module, and cv is a subclass inside cv2 . You need to call import as cv to access it.)

How do I add more modules to OpenCV?

  1. Go to C:/Python27/lib/site-packeges (the site-packages folder where your python is installed), and delete cv2. pyd if present.
  2. Downloading OpenCV with extra modules. Create a directory called opencv-3.0 and create two other folders in the directory: build and source.

How do I know if python OpenCV contrib is installed?

Is it possible to build OpenCV with contrib modules?

You can build OpenCV, so it will include the modules from this repository. Contrib modules are under constant development and it is recommended to use them alongside the master branch or latest releases of OpenCV. Here is the CMake command for you:

How to add OpenCV contrib to CMake core?

If you prefer using the gui version of cmake (cmake-gui), then, you can add opencv_contrib modules within opencv core by doing the following: start cmake-gui. select the opencv source code folder and the folder where binaries will be built (the 2 upper forms of the interface)

What is the version number for OpenCV 3.0?

Since 3.0 release we change the version enumeration scheme. Instead of 3-digit version number, like 2.4.9 (where 4-digit version is used for intermediate updates), we will use 2-digit (3.0, 3.1 etc.) with the 3rd digit used for the intermediate updates.

Do you need linker flags for OpenCV contrib?

To run, linker flags to contrib modules will need to be added to use them in your code/IDE. For example to use the aruco module, “-lopencv_aruco” flag will be added. In order to keep a clean overview containing all contributed modules, the following files need to be created/adapted: